WOW. That's likely a western green drake nymph? I fished the Cedar hardcore the first 4 years after it re-opened and I don't think I ever saw an adult. Your WA chart on your website suggests they'd be hatching June-July. I'm not saying this in any way doubting your ability to identify, I mean, you're all over this stuff... I'm just amazed that I've never seen Green Drake adults on the Cedar or even thought to fish them there. I have, however, seen adults on the little Deschutes here and it's productive on that little river when they're happening.

Oh, one more thing though: I haven't really fished the upper river there below Landsburg nearly as much as I fished the lower river. Would you expect they may be more prevalent in the higher gradient stream up there?

I'm not saying this in any way doubting your ability to identify, I mean, you're all over this stuff... I'm just amazed that I've never seen Green Drake adults on the Cedar or even thought to fish them there.

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Well, that's a relief.

I haven't really fished the upper river there below Landsburg nearly as much as I fished the lower river. Would you expect they may be more prevalent in the higher gradient stream up there?

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Perhaps, but I don't really know.

One thing that I would recommend doing:
Take a jar lid along next time. Place the nymph you want to photograph in it, and then add enough water to fully cover the nymph. This allows the nymph's appendages to freely move, and will result in a photo which is much more useful for identification purposes.

FlyFishingEntomology.com

Helping to fill a gap here on WFF with Entomology will be Roger Rohrbeck (Taxon). Roger has an impressive piece of work with FlyfishingEntomology.com and has consistently been the source of answers on the subject here on WFF. Rather than overlap efforts on the subject we'll have this forum area dedicated to subject with Roger moderating. Note the links below to his site. Thanks.